As far as the custom exhaust goes, I think you're opening up a pandora's box of engineeering problems/ frustration. What do you hope to gain that a 1st rate exhaust manufacturer has not? There are so many options of ready made exhausts, I cannot see why you'd want to take the project on. At the end of the day, I highly suspect you'll be over the cost of a new exhaust by the time you figure out how to make yours do what you want it to.
As for the FabSpeed, the rear muffler is actually made by Dansk... can be had from Dansk directly for much less $
Patrick
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